Pulverizing-mill.



J. O. CLARK.

PULVEBIZING HILL.

APPLICATION nun no. 5, 1008.

940, 1 29. Patented Nov. 16. 1909.

a sums-sum 1.

J. G. CLA

PULVERIZING MILL. APPLIOATIOH rILnn 11120. 6, M9

Patented Nov. 16, 1909.

a SHBETB-BHBET JOHN C. CLARK, 0F ATLANTA, GEORGIA.

PULVERIZING-MILL.

Specification of Letters Patent.

Patented Nov. 16, 1909.

Application filed December 5, 1908. Serial No. 466,160.

To all whom it may concern:

Be it known that I, JOHN C. CL RK, a citizen of the United States, andresident of Atlanta, in the county of Fulton and State of Georgia, haveinvented certain new and useful lmprovements in Pulverizing Mills, ofwhich the following is a specification.

My invention relates to that class of pul verizing mills in whichgrinding members are rotatable within rotatable basins, and my inventionconsists in combining with the rotatable basin and its grinding membersa stationary pressure device adjustable to vary the pressure upon thesaid members, and in certain details of construction fully set forthhereinafter and illustrated in the accompanying drawing, in which:

Figure 1 is a sectional elevation of a pulverizing mill embodying myinvention; and Fig. 2 is a sectional plan on the line 2 2, Fig. l.

The frame A of the apparatus is of any suitable construction having abed-plate 2 and a spider 3, in the center of which is a box Bconstituting the upper bearing of a vertical shaft C, the lower bearingof which is in a step 4. The shaft is provided with a pulley 5, to whichmotion may be imparted from any suitable source. Keyed to the shaft nearthe lower end thereof is a pan or basin D having an annular channel orgroove 00 to receive the loose grinding members E, which as shown are inthe form of balls or spheres. This channel m may be formed in the panitself, but preferably is formed in a grinding ring F which is bolted tothe pan by bolts 6 extending downward through coinciding channels in thepan and in the periphery of the ring F.

Upon the grinding members E rests a pressure ring G which has an annularchannel adapted to the contour of the grinding members E and which isbolted to and carried by a ring frame H, so supported as to be capableof vertical movement without revolving. As shown, arms 7 extend upwardfrom the frame H through openings in the spider 3, and the said arms mayslide vertically in said openings to permit an desired degree ofvertical movement of t e frame and its ring, while restraining the samefrom revolution. A spout or chute 8 extends through an opening in thespider, its lower end close to the shaft 0 so that the material isdelivered to the basin as near the center of the same as possible.

To the periphery of the basin secured the lower edge of a suitablescreen 1, stiffened at the upper edge by means of a stiff ring 10, andat intervals at the outer side of the screen are ribs 12, and a contactblock or piece 13 is bolted to the frame A in such position as to bestruck by the ribs 12 in succession as the basin rotates. An opening 3/in the bed-plate 2 permits material which may be carried onto thebed-plate to pass downward to a suitable receptacle.

The material to be ground is fed preferably continuously in smallportions at a time into the basin through the spout 8, and a high degreeof rotative speed is imparted to the said basin, when the material willtend to move outward by centrifugal action and will be brought intocontact with the spheres E and into the channel 00, and will be crushedby the action of the said spheres as they are carried around in saidchannel, the degree of crushing action of the spheres being regulated bythe pressure applied thereto, which may be regulated by depositing anysuitable weights upon the frame H or upon the arms 7, projecting upwardthrough the frame, which arms may have suitable supports 14: to secureand support the weights Y.

Inasmuch as the ring G, while vertically adjustable, cannot revolve, thecontact of the rotative members therewith results in insuring a comaratively positive rotation of the said mem ers, and thereby secures anincreased crushing effect over what would re sult if the members did notthus travel in contact with the stationary track.

As the material is ground it is thrown outward against the screen andwhen fine enough to pass through the mesh passes downward onto thebed-plate and out through the opening y, and the screen is preventedfrom being clogged by the jarring of the same resulting from the contactof the ribs 12 with the stationary contact piece or block 13.

I do not here claim broadly the combina tion of a rotative basin androtatable members arran ed to act therein with means for carrying t liemembers forcibly against the face of the ring, as this constitutes thesubiect of a separate application for Letters atent.

Without limiting myself to the construction and arrangement shown, Iclaim:

1. The combination in a grinding machine of a vertieal rotatable shaft,a basin carried at the lower end of the said shaft provided with agrooved annular grinding face, a series of spherical grinding members, aring resting upon said members, arms extending upwardly from said ring,means for sup porting removable wei "llts upon said arms, and astationary spid er having openings through which the arms extend.

2. The combination in a grinding machine of a vertieal rotatable shaft,a basin carried at the lower end of the said shaft provided with agrooved annular grinding fare, a series of spherical grinding members, aring resting upon said members, arn'is extending upwardly from saidring, means for sup porting removable Weights upon said arms, astationary spider havmg openings through which the arms extend, and ascreen carried by the, basin and extending therefrom to said spider.

3. The combination of the frame, central bearings, shaft rotating insaid bearings, a

basin earried by the shaft, grinding mem bers in the basin, a yieldingscreen carried by the basin and extending upward from the peripherythereof, vertical ribs on said screen, and a rigid eontaot pieee carriedby the frame in position to be struck by the ribs.

4. The eombination in a grinding machine, of a vertieal rotatable shaft,a basin earried at the lower end of the said shaft and provided with agrooved annular grinding face, a series of spherical grinding men bers,a ring restin r upon said members, arms extending upwardly from saidring, means for applying pressure to said arms, and a stationary spiderhaving openings through which the arms extend.

In testimony whereof I atlix my signature in presenee of two witnesses.

JOHN (J. CLARK.

\Vitnesses E. W. Commas, Enwann JonNsoN.

